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| import java.util.*;
public class _721账户合并 {
public List<List<String>> accountsMerge_gov(List<List<String>> accounts) {
Map<String, Integer> emailToIndex = new HashMap<String, Integer>();
Map<String, String> emailToName = new HashMap<String, String>();
int emailsCount = 0;
for (List<String> account : accounts) {
String name = account.get(0);
int size = account.size();
for (int i = 1; i < size; i++) {
String email = account.get(i);
if (!emailToIndex.containsKey(email)) {
emailToIndex.put(email, emailsCount++);
emailToName.put(email, name);
}
}
}
UnionFind uf = new UnionFind(emailsCount);
for (List<String> account : accounts) {
String firstEmail = account.get(1);
int firstIndex = emailToIndex.get(firstEmail);
int size = account.size();
for (int i = 2; i < size; i++) {
String nextEmail = account.get(i);
int nextIndex = emailToIndex.get(nextEmail);
uf.union(firstIndex, nextIndex);
}
}
Map<Integer, List<String>> indexToEmails = new HashMap<Integer, List<String>>();
for (String email : emailToIndex.keySet()) {
int index = uf.find(emailToIndex.get(email));
List<String> account = indexToEmails.getOrDefault(index, new ArrayList<String>());
account.add(email);
indexToEmails.put(index, account);
}
List<List<String>> merged = new ArrayList<List<String>>();
for (List<String> emails : indexToEmails.values()) {
Collections.sort(emails);
String name = emailToName.get(emails.get(0));
List<String> account = new ArrayList<String>();
account.add(name);
account.addAll(emails);
merged.add(account);
}
return merged;
}
static class UnionFind {
int[] parent;
public UnionFind(int n) {
parent = new int[n];
for (int i = 0; i < n; i++) {
parent[i] = i;
}
}
public void union(int index1, int index2) {
parent[find(index2)] = find(index1);
}
public int find(int index) {
if (parent[index] != index) {
parent[index] = find(parent[index]);
}
return parent[index];
}
}
public List<List<String>> accountsMerge(List<List<String>> accounts) {
Map<String, Set<String>> mapAccount = new HashMap<>();
Map<String, String> mapEmail = new HashMap<>();
for (int i = 0; i < accounts.size(); i++) {
List<String> strings = accounts.get(i);
Set<String> temp = new HashSet<>();
Set<String> set = new HashSet<>(strings.subList(1, strings.size()));
String name = i + "-" + strings.getFirst();
for (String email : set) {
if (mapEmail.containsKey(email)) {
String nameBefore = mapEmail.get(email);
if (mapAccount.containsKey(nameBefore)) {
temp.addAll(mapAccount.get(nameBefore));
mapAccount.remove(nameBefore);
}
}
mapEmail.put(email, name);
}
for (String email : temp) {
mapEmail.put(email, name);
}
temp.addAll(set);
mapAccount.put(name, temp);
}
List<List<String>> res = new ArrayList<>();
mapAccount.forEach((key, value) -> {
List<String> list = new ArrayList<>(value);
Collections.sort(list);
list.addFirst(key.split("-")[1]);
res.add(list);
});
return res;
}
public static void main(String[] args) {
_721账户合并 accountMerge = new _721账户合并();
List<List<String>> accounts = new ArrayList<>();
accounts.add(new ArrayList<>(List.of("Isa", "Isa6@m.co", "Isa0@m.co", "Isa1@m.co", "Isa6@m.co", "Isa1@m.co")));
accounts.add(new ArrayList<>(List.of("David", "David10@m.co", "David12@m.co", "David7@m.co", "David6@m.co", "David1@m.co")));
accounts.add(new ArrayList<>(List.of("Alex", "Alex1@m.co", "Alex7@m.co", "Alex6@m.co", "Alex11@m.co", "Alex2@m.co")));
accounts.add(new ArrayList<>(List.of("Hanzo", "Hanzo11@m.co", "Hanzo2@m.co", "Hanzo5@m.co", "Hanzo5@m.co", "Hanzo3@m.co")));
accounts.add(new ArrayList<>(List.of("Bob", "Bob12@m.co", "Bob1@m.co", "Bob12@m.co", "Bob7@m.co", "Bob5@m.co")));
accounts.add(new ArrayList<>(List.of("Isa", "Isa4@m.co", "Isa1@m.co", "Isa3@m.co", "Isa9@m.co", "Isa2@m.co")));
accounts.add(new ArrayList<>(List.of("Kevin", "Kevin0@m.co", "Kevin7@m.co", "Kevin12@m.co", "Kevin3@m.co", "Kevin5@m.co")));
accounts.add(new ArrayList<>(List.of("David", "David12@m.co", "David6@m.co", "David10@m.co", "David0@m.co", "David8@m.co")));
accounts.add(new ArrayList<>(List.of("Celine", "Celine0@m.co", "Celine8@m.co", "Celine10@m.co", "Celine2@m.co", "Celine12@m.co")));
accounts.add(new ArrayList<>(List.of("Kevin", "Kevin1@m.co", "Kevin8@m.co", "Kevin5@m.co", "Kevin9@m.co", "Kevin0@m.co")));
accounts.add(new ArrayList<>(List.of("Alex", "Alex3@m.co", "Alex8@m.co", "Alex1@m.co", "Alex12@m.co", "Alex12@m.co")));
accounts.add(new ArrayList<>(List.of("Kevin", "Kevin8@m.co", "Kevin12@m.co", "Kevin1@m.co", "Kevin10@m.co", "Kevin9@m.co")));
for (List<String> strings : accountMerge.accountsMerge(accounts)) {
System.out.println(strings);
}
}
}
|